405666827 has 2 divisors, whose sum is σ = 405666828. Its totient is φ = 405666826.

The previous prime is 405666799. The next prime is 405666851. The reversal of 405666827 is 728666504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405666827 - 2⁶ = 405666763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (405666857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202833413 + 202833414.

It is an arithmetic number, because the mean of its divisors is an integer number (202833414).

Almost surely, 2^405666827 is an apocalyptic number.

405666827 is a deficient number, since it is larger than the sum of its proper divisors (1).

405666827 is an equidigital number, since it uses as much as digits as its factorization.

405666827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 405666827 is about 20141.1724335998. The cubic root of 405666827 is about 740.2694581150.

The spelling of 405666827 in words is "four hundred five million, six hundred sixty-six thousand, eight hundred twenty-seven".